yea, given the progress we've made in harnessing physics over the past few hundred years, extrapolating for the lifetime of our species, as long as we're around for long enough to figure out time travel...
we should be able to come back, which means we would already be doing so? as long as the preconditions remain true... either way we would probably have some sort of "butterfly effect/grandfather paradox" laws in place
that said, the value of future earth visiting past earth would likely be 'kitsch' at best :P
we should be able to come back, which means we would already be doing so? as long as the preconditions remain true... either way we would probably have some sort of "butterfly effect/grandfather paradox" laws in place
that said, the value of future earth visiting past earth would likely be 'kitsch' at best :P